Manufacturing method for piezoelectric ceramics

Abstract

Provided are a barium titanate-based piezoelectric ceramics having satisfactory piezoelectric performance and a satisfactory mechanical quality factor (Q m ), and a piezoelectric element using the same. Specifically provided are a piezoelectric ceramics, including: crystal particles; and a grain boundary between the crystal particles, in which the crystal particles each include barium titanate having a perovskite-type structure and manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal with respect to the barium titanate, and the grain boundary includes at least one compound selected from the group consisting of Ba 4 Ti 12 O 27 and Ba 6 Ti 17 O 40 , and a piezoelectric element using the same.

The invention claimed is: 
     
       1. A manufacturing method for a piezoelectric ceramics, comprising at least:
 producing granulating powder by adding a binder to barium titanate particles each comprising manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal; and 
 sintering a mixture prepared by adding at least one compound selected from the group consisting of Ba 4 Ti 12 O 27  particles and Ba 6 Ti 17 O 40  particles to the granulating powder. 
 
     
     
       2. A manufacturing method for a piezoelectric ceramics, comprising at least:
 producing granulating powder by adding a binder to barium titanate particles each comprising manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal; and 
 sintering a mixture prepared by adding titanium oxide particles each having an average particle diameter of 100 nm or less to the granulating powder.